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Wastegate for an engine system

a wastegate and engine technology, applied in the direction of combustion engines, machines/engines, internal combustion piston engines, etc., can solve the problems of reducing flow efficiency and energy losses, and affecting the efficiency of combustion engines,

Active Publication Date: 2018-05-10
FORD GLOBAL TECH LLC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent text describes a wastegate design for turbocharger systems that improves flow efficiency, reduces energy losses, and enhances catalyst lightoff. The wastegate valve is designed with a multiplane curved surface and a constricted section to guide exhaust flow and increase speed downstream of the wastegate. The design also allows for separate passages for exhaust from different groups of cylinders, reducing exhaust energy loss and improving fuel economy and performance. Additionally, the wastegate valve reduces exhaust energy losses to turbocharger walls and increases catalyst lightoff.

Problems solved by technology

As a result, exhaust energy may be transmitted to the turbocharger walls leading to reduced flow efficiency and energy losses.
Also, since the flow fans out in multiple directions before flowing downstream, less exhaust heat may reach the catalyst and thus delayed catalyst lightoff may occur.

Method used

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Examples

Experimental program
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Effect test

first embodiment

[0040]The following description relates to a turbocharger system with a bifurcated bypass passage configured with a wastegate to control exhaust flow around a twin scroll turbine and to an exhaust catalyst placed downstream of the turbine in an engine, as shown in FIG. 1. As depicted in FIG. 2A, an example engine turbocharger having a wastegate valve including a valve actuation mechanism to control exhaust flow within a bypass passage around the turbine and to the exhaust catalyst is disclosed. The wastegate valve may be adjusted to open or close by the actuator mechanism using various means including mechanical, hydraulic, electrical, and other suitable actuation methods. FIG. 2B shows a schematic view of the wastegate including a valve plate and a valve plate actuator. The wastegate also includes a passage with a curved interior surface that may act to direct exhaust flow delivered from engine cylinders (via the exhaust passage) to the exhaust catalyst.

second embodiment

[0041]FIG. 3A shows a first view of the wastegate valve in a closed wastegate position and having a passage having a constricted section formed on an internal wall of the passage. The wastegate valve may be adjusted into an open position to allow exhaust flow through an outlet of the wastegate, as shown in FIG. 3B. An alternative embodiment of the wastegate valve in an open position and having a passage with no constricted section formed on an internal wall of the passage is depicted in FIG. 3C. In this case, the exhaust gas may flow in multiple directions, as shown. The exhaust flow fanning out of the wastegate outlet, may impinge on walls of the exhaust passage downstream of the valve and cause turbulent flow conditions, which may lead to exhaust energy loss.

third embodiment

[0042]FIGS. 4A-4E show a wastegate valve that includes a rib extending from an inner portion of a valve plate. The rib may divide the valve plate into a first and a second section. The valve plate includes a rib that connects to a base plate, and extends outward into a wastegate passage. As an example, the rib may include a curved portion connected to a linear portion, as shown in FIG. 4D. A cross sectional view of the wastegate passage is depicted in FIG. 4E. In this case, the central wall bifurcates the passage into a first and a second side.

[0043]FIGS. 5A-5C show schematic views of a valve plate of a fourth embodiment of the wastegate valve. FIGS. 5A-5B show a first and second view, respectively of the valve plate of the fourth embodiment of the wastegate valve. FIG. 5C shows a third view of the valve plate of the fourth embodiment of the wastegate valve. FIGS. 6A-6B show schematic views of the fourth embodiment of the wastegate valve in a closed position. FIG. 6A shows a first v...

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Abstract

Methods and systems are provided for a wastegate of a turbocharger including a valve plate, valve actuation mechanism, and a bifurcated wastegate passage. In one example design, the wastegate may include a valve plate having an interior with a multiplane curved surface and a first mating feature centered along the curved surface, the curved surface forming a raised edge and a side opening on opposite sides of the valve plate; and a passage bifurcated by a central wall, an end of the central wall including a second mating feature adapted to have face-sharing contact with the first mating feature. The first mating feature may be either a rib or recessed slot formed on the valve plate, and the second mating feature may be one end of the central wall.

Description

CROSS REFERENCE TO RELATED APPLICATION[0001]The present application is a continuation-in-part of U.S. patent application Ser. No. 15 / 347,669, entitled “A WASTEGATE FOR AN ENGINE SYSTEM,” filed on Nov. 9, 2016, the entire contents of which are hereby incorporated by reference for all purposes.FIELD[0002]The disclosure relates to methods and systems of a wastegate mounted to an exhaust passage of a turbocharger to direct exhaust flow to an exhaust catalyst.BACKGROUND AND SUMMARY[0003]Exhaust flow in a turbocharger system may be partially directed to an exhaust driven turbine to drive a compressor that delivers air into engine cylinders, while the remaining portion of the exhaust gas may be flowed via a bypass passage around the turbine to an exhaust catalyst placed downstream of the turbine. The bypass passage may include a wastegate valve that may be adjusted into an open position, thereby allowing exhaust gases to bypass the turbine and flow to the catalyst. The wastegate valve may ...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F02B37/18F02B37/02
CPCF02B37/025F02B37/186Y02T10/12
Inventor MIAZGOWICZ, KEITH D.MCCONVILLE, GREGORY PATRICK
Owner FORD GLOBAL TECH LLC